High-frequency power supply device

Abstract

A high-frequency power supply device includes a power transmission coil, a high-frequency power circuit which converts direct-current power input from a direct-current power supply into high-frequency power and supply the high-frequency power to the power transmission coil, a detection circuit which detects a voltage based on a circuit operation of the high-frequency power circuit and output a detected voltage, a control circuit configured to control a circuit operation of the high-frequency power circuit and to determine a command value used to protect the high-frequency power supply device based on information externally input into a processor, a D/A converter which performs D/A conversion upon receiving the command value output from the control circuit and output a command voltage, and a comparator which compares the command voltage and the detected voltage with each other and output a stop signal used to stop a circuit operation of the high-frequency power supply device.

What is claimed is: 
     
       1. A high-frequency power supply device comprising:
 a power transmission coil that is magnetically coupled to a power receiving coil in a power receiving circuit; 
 a high-frequency power circuit configured to convert direct-current power input from a direct-current power supply into high-frequency power and supply the high-frequency power to the power transmission coil; 
 a detection circuit configured to detect a voltage based on a circuit operation of the high-frequency power circuit and output a detected voltage; 
 a control circuit configured to control a circuit operation of the high-frequency power circuit, the control circuit including a processor into which information is input from an external device, and the controller being configured to determine a command value on the basis of the information, such that the controller determines the command value based on a value with which the high-frequency power circuit is protected; 
 a D/A converter configured to perform D/A conversion upon receiving the command value output from the control circuit and output a command voltage; and 
 a comparator comprising an analog electronic circuit and configured to compare the command voltage and the detected voltage with each other and output a stop signal, used to stop a circuit operation of the high-frequency power circuit, to the high-frequency power circuit. 
 
     
     
       2. The high-frequency power supply device according to  claim 1 , wherein
 the high-frequency power circuit includes a switching element connected to the direct-current power supply and a driver circuit configured to drive the switching element, 
 the control circuit is configured to supply a switching control signal to the driver circuit, 
 the control circuit is configured to supply a stop signal to one of a control terminal of the switching element, the driver circuit, and the control circuit, and 
 a delay time from a time at which the stop signal starts to be input into a control terminal of the switching element to a time at which a power conversion circuit operation of the high-frequency power circuit stops, a delay time from a time at which the stop signal starts to be input into the driver circuit to a time at which a power conversion circuit operation of the high-frequency power circuit stops, and a delay time from a time at which the stop signal starts to be input into the control circuit to a time at which a power conversion circuit operation of the high-frequency power circuit stops, are set to decrease in this order. 
 
     
     
       3. A high-frequency power supply device comprising:
 a power transmission coil that is magnetically coupled to a power receiving coil in a power receiving circuit; 
 a high-frequency power circuit configured to convert direct-current power input from a direct-current power supply into high-frequency power and supply the high-frequency power to the power transmission coil; 
 a detection circuit configured to detect a voltage based on a circuit operation of the high-frequency power circuit and output a detected voltage; 
 a control circuit configured to control a circuit operation of the high-frequency power circuit, and configured to determine a command value based on a value with which the high-frequency power circuit is protected; 
 a D/A converter configured to perform D/A conversion upon receiving the command value output from the control circuit and output a command voltage; and 
 a comparator comprising an analog electronic circuit and configured to compare the command voltage and the detected voltage with each other and output a stop signal, used to stop a circuit operation of the high-frequency power circuit, to the high-frequency power circuit, 
 wherein 
 the high-frequency power circuit includes a switching element connected to the direct-current power supply and a driver circuit configured to drive the switching element, 
 the control circuit is configured to supply a switching control signal to the driver circuit, 
 the control circuit is configured to supply a stop signal to one of a control terminal of the switching element, the driver circuit, and the control circuit, and 
 a delay time from a time at which the stop signal starts to be input into a control terminal of the switching element to a time at which a power conversion circuit operation of the high-frequency power circuit stops, a delay time from a time at which the stop signal starts to be input into the driver circuit to a time at which a power conversion circuit operation of the high-frequency power circuit stops, and a delay time from a time at which the stop signal starts to be input into the control circuit to a time at which a power conversion circuit operation of the high-frequency power circuit stops, are set to decrease in this order. 
 
     
     
       4. The high-frequency power supply device according to  claim 3 , wherein
 the detection circuit is one of a plurality of detection circuits each configured to detect a voltage based on a circuit operation of a corresponding portion of the high-frequency power circuit and output the detected voltage, 
 the D/A converter is one of a plurality of D/A converters each configured to perform D/A conversion upon the command value output from the control circuit and output the command voltage, 
 the comparator is one of a plurality of comparators each configured to compare the command voltage and the detected voltage with each other and output the stop signal, and 
 the stop signal is supplied to two or more of the switching element, the driver circuit, and the control circuit. 
 
     
     
       5. The high-frequency power supply device according to  claim 4 , wherein
 the voltage based on a circuit operation of the high-frequency power circuit includes two or more of a voltage input from the direct-current power supply, a voltage corresponding to a magnitude of a current input from the direct-current power supply, a voltage corresponding to a magnitude of a resonant voltage at the power transmission coil, a voltage corresponding to a temperature of the switching element, and a voltage corresponding to a magnitude of a current flowing through the switching element. 
 
     
     
       6. The high-frequency power supply device according to  claim 5 , wherein
 a set of the detection circuit, the D/A converter, and the comparator is provided in plurality in accordance with a response speed requested for a protection circuit operation of the high-frequency power circuit. 
 
     
     
       7. The high-frequency power supply device according to  claim 4 , wherein
 a set of the detection circuit, the D/A converter, and the comparator is provided in plurality in accordance with a response speed requested for a protection circuit operation of the high-frequency power circuit. 
 
     
     
       8. The high-frequency power supply device according to  claim 4 , wherein
 the stop signals output from the plurality of respective comparators are supplied such that an OR circuit is formed in one of the switching element, the driver circuit, and the control circuit. 
 
     
     
       9. The high-frequency power supply device according to  claim 4 , wherein
 the control circuit includes a command value correction unit configured to correct the command value in accordance with a temperature in an operating environment of the high-frequency power circuit. 
 
     
     
       10. The high-frequency power supply device according to  claim 4 , wherein
 the control circuit includes a correction unit configured to perform analysis on the basis of a set of data on a temperature in an operating environment of the high-frequency power circuit, an operating time of the high-frequency power circuit, and the detected voltage, extract a rule or a judgement criterion from the set of data, and correct the command value on the basis of the rule or the judgement criterion by machine learning. 
 
     
     
       11. The high-frequency power supply device according to  claim 3 , wherein
 the detection circuit is one of a plurality of detection circuits each configured to detect a voltage based on a circuit operation of a corresponding portion of the high-frequency power circuit and output the detected voltage, 
 the D/A converter is one of a plurality of D/A converters each configured to perform D/A conversion upon the command value output from the control circuit and output the command voltage, 
 the comparator is one of a plurality of comparators each configured to compare the command voltage and the detected voltage with each other and output the stop signal, and 
 the stop signals output from the plurality of respective comparators are supplied such that an OR circuit is formed in one of the switching element, the driver circuit, and the control circuit. 
 
     
     
       12. The high-frequency power supply device according to  claim 11 , wherein
 the voltage based on a circuit operation of the high-frequency power circuit includes two or more of a voltage input from the direct-current power supply, a voltage corresponding to a magnitude of a current input from the direct-current power supply, a voltage corresponding to a magnitude of a resonant voltage at the power transmission coil, a voltage corresponding to a temperature of the switching element, and a voltage corresponding to a magnitude of a current flowing through the switching element. 
 
     
     
       13. The high-frequency power supply device according to  claim 11 , wherein
 a set of the detection circuit, the D/A converter, and the comparator is provided in plurality in accordance with a response speed requested for a protection circuit operation of the high-frequency power circuit. 
 
     
     
       14. The high-frequency power supply device according to  claim 3 , wherein
 the control circuit includes a command value correction unit configured to correct the command value in accordance with a temperature in an operating environment of the high-frequency power circuit. 
 
     
     
       15. The high-frequency power supply device according to  claim 3 , wherein
 the control circuit includes a correction unit configured to perform analysis on the basis of a set of data on a temperature in an operating environment of the high-frequency power circuit, an operating time of the high-frequency power circuit, and the detected voltage, extract a rule or a judgement criterion from the set of data, and correct the command value on the basis of the rule or the judgement criterion by machine learning. 
 
     
     
       16. The high-frequency power supply device according to  claim 1 , wherein
 the control circuit includes a command value correction unit configured to correct the command value in accordance with a temperature in an operating environment of the high-frequency power circuit. 
 
     
     
       17. The high-frequency power supply device according to  claim 1 , wherein
 the control circuit includes a correction unit configured to perform analysis on the basis of a set of data on a temperature in an operating environment of the high-frequency power circuit, an operating time of the high-frequency power circuit, and the detected voltage, extract a rule or a judgement criterion from the set of data, and correct the command value on the basis of the rule or the judgement criterion by machine learning. 
 
     
     
       18. A high-frequency power supply device comprising:
 a power transmission coil that is magnetically coupled to a power receiving coil in a power receiving circuit; 
 a high-frequency power circuit configured to convert direct-current power input from a direct-current power supply into high-frequency power and supply the high-frequency power to the power transmission coil; 
 a detection circuit configured to detect a voltage based on a circuit operation of the high-frequency power circuit and output a detected voltage; 
 a control circuit configured to control a circuit operation of the high-frequency power circuit, and configured to determine a command value based on a value with which the high-frequency power circuit is protected; 
 a plurality of D/A converters that output a command voltage by respectively D/A conversion of different command values that are output from the control circuit and that differ in accordance with the response speed of each of a plurality of output destinations that output a stop signal to stop the circuit operation of the high-frequency power circuit; and 
 a plurality of comparators, each consisting of an analog electronic circuit, are connected to the output destination according to the command voltage input from the plurality of D/A converters, and configured to compare the command voltage and the detected voltage with each other and output a stop signal, used to stop a circuit operation of the high-frequency power circuit, to the high-frequency power circuit.